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A boy standing on a weighing machine obs...

A boy standing on a weighing machine observes his weight as 200 N. When he suddenly jumpes upwards, his friend notices that the reading increased to 400 N. The acceleration by which the boy jumped will be-

A

`9.8m//s^(2)`

B

`29.4m//s^(2)`

C

`4.9m//s^(2)`

D

`14.7m//s^(2)`

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